{"id":"CVE-2019-12331","aliases":["GHSA-vvwv-h69m-wg6f"],"url":"https://o3.security/vulnerability/CVE-2019-12331","summary":"XXE in PHPSpreadsheet due to incomplete fix for previous encoding issue","details":"PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue. The XmlScanner decodes the sheet1.xml from an .xlsx to utf-8 if something else than UTF-8 is declared in the header. This was a security measurement to prevent CVE-2018-19277 but the fix is not sufficient. By double-encoding the the xml payload to utf-7 it is possible to bypass the check for the string ‚<!ENTITY‘ and thus allowing for an xml external entity processing (XXE) attack.","published":"2019-11-07T15:15:10.697Z","modified":"2026-08-07T15:00:05.997799Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","fixedVersion":"1.8.0"},{"ecosystem":"Packagist","name":"phpoffice/phpexcel","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01"},{"type":"EVIDENCE","url":"https://herolab.usd.de/security-advisories/usd-2019-0046/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:00:05.997799Z"}}